SCIENCE. 



Vol. XXII. No. 5^0 



Frobdbly you take 



THE 



Electrical Engineer. 



Most people interested in Electricity 

 do. j 



If you do not, now is a good time to 

 begin. 



It is pnblisliPd every Wednesday. 



Subscription, $3.00 per year. 



Yon can try it three months for fifty 

 cents. 



Address: 



^The Electrical Engineer, 

 203 Broadway, - - - New York, K. Y. 



Every reader of "Science" should sub- 

 scribe for the 



AMERICAN ARCHITECT, 



XBE OZDEST AND BEST 



Architectural publication in the country. 

 Interesting articles on architecture. Sani- 

 tation, Archaeology, Decoration, etc., by the 

 ablest writers. Richly illustrated. Issued 

 ■weekly. Send stamp for specimen copy to 

 the publishers, 



Ticknor & Co., 211 Tremont St., Boston. 

 ^ 18G9. THE ISi)3. 



Manufacturer and Builder. 



Published Monthly. A handsomely illustrated me- 

 chanical journal, edited by Dr. WrLLiAM H. Wahl. 

 Every number consists of 48 large quarto pages and 

 cover, filled with useful information on all subjects 

 of a practical nature. Specimen copy free. For 

 sale by all newsdealers. Agents wanted every- 

 where. Address 



HENRI GERARD, i 



P. O. Box 1001. 83 Nassau St., N. ^.| 



selling 



LIGHTCiiNG PLATER 



and plating jewelrjiwatchea 

 tableware, &c. Flatea the 

 finest of jewelry good as 

 new, on all kinds of metal 

 wiih gold, silver or nickel. 

 No capital. 



Littsll's Living Age, 



THE ONLY WEEKLY ECLECTIC. 



1844. 1893. 



^*^The Oldest and the Best,'' 



It selects from the whole wide field of 

 EUROPEAN PERIODICAL LITERATURE 

 the best articles by 

 THE ABLBST LSVINI^ fVRlTE:RS 

 In every department of 

 Literature^ Science^ Politics and Art. 

 OPINIONS. 

 "Only the best has ever filled its pages; the 

 best thought rendered in the purest English. 

 Nothing poor or unworthy has ever appeared in 

 the columns of The Living Age."— T/ie Presby- 

 terian^ Phila. 



" Considering its size, it is the cheapest of 

 literary periodicals, and no collection of maga- 

 zine literature is complete without this fore- 

 most of e(i\Qctic&."''-Educational Courant, Louis- 

 ville^ Ky. 



"It is one of the few periodicals which seem 

 indispensable. ... It contains nearly all the 

 good literature of the time."— T/iC CJuirckman, 

 New York. 



"The fields of fiction, biography, travel, sci- 

 ence, poetry, criticism, and social and religious 

 discussion all come within its domain.'*'— Bos- 

 ton Journal. 



" To read it is itself an education in the course 

 of modern thought and literature." — Buffalo 

 ; CoTtmiercia^ Advertiser. 



I Published Weekly at $8.00 a year, free of 

 ' postage. 



Club E-ates. — For $10. 15 The Living 

 Age and Science will be sent for a 

 year, postpaid. 

 Rates for clubbing The Living Age with other 

 periodicals will be sent on application. 



Sample copies of The Living Age, 15 cents 

 each. Address, f 



Littell & Co., 3 1 Bedford St., Boston, ^ass. 



BRENTANO'S, 



Publishers, Importers, Booksellers. 



"We make a specialty of technical works in all 

 branches of science, and in all languages. 



Subscriptions taken for aU American and foreign 

 scientific periodicals. 



Our Paris and London branches enable us to im- 

 port at shortest notice and lowest prices. Reports 

 OF Scientific Societies, Monogiiaphs, Government 

 Reports, etc. Correspondence solicited. 



fl^^ All books revieiced in Science can be ordered 

 from us. 



Send for a Sample Copt op Book Chat. A Month- 

 ly Index of the Periodical Literature of the "World. 

 SI. 00 per year. 



Newspaper Clippings, 25,000 in Stocli:. ! 

 Wbat do you want? iet us know. We , 

 can supply you. The Clemens Ne\Ts 

 Agency, Box 2329, San Francisco, Cal. I 



BEENTAK'O'S, TJuion Square, New York, 



Chicago, Washington, London, Paris. 



LIGHT, HEAT AND POWER. 



?■//£ INDEPENDENT GAS JOURNAL 

 OF AMERICA. 



Published Monthly at Philadelphia. 



Suiscripiion, %'i.(x> per year. 



RESTORE YOUR EYESiaHT 



Cataracts, scars or films can be absorbed and 

 paralyzed nerves restored, without the knife 

 or risk. Diseased eyes or lids can be cured by 

 our home treatment. "We prove It." Hun- 

 dreds convinced. Our illustrated pamphlet, 



The Boston Medical and 

 Surgical Journal, 



BOSTON, _ - - _ MASSACHUSETTS. 



A FIRST-CUSS WEEKLY MEDICAL NEWSPAPER. ESTABLISHED 1828, 



Terms of Subscription ! In the TTnited States, and to Canada and Mexico, S5 00 a year In ad 

 vance. To Foreign Countries embraced intlie Universal Postal Union, $1.56 a year additional. Single 

 numbers, 15c. 'J en consecutive numbers free by mail on receipt of Jl.OO. 



This Journal circulates chiefly through the New England States, and is seen by the great majority 

 of the profession in that important district. As a means of reaching physicians it is unequalled. 



; under the editorial management of Dr. George B. Shattuck, assisted by a large staff of compe- 



tent coadjutors. Subscriptions and advertisements received by the i 

 by mail should be sent by money-order, draft or registered letter. 



adersigned, to whom remittances 



DAMRELL & UPHAM, 283 WasMngtoa Street, Boston, Mass. 



RACES AND PEOPLES. 



By DANIEL G. BRINTON, M.D. 



"The book is good, thoroughly good, and will long 

 remain the best accessible elementary ethnography 

 in our language." — The Christian Union. 



"We strongly recommend Dr. Brinton's 'Races 

 and Peoples' to both beginners and scholars. We 

 are uot aware of any other recent work on the 

 science of which it treats in the English language." 

 — A.siatic Quarterly. 



"His book is an excellent one, and we can heartily 

 recommend it as an introductory manual of ethnol- 

 ogy.'"'— ??ie Monist. 



"A useful and really interesting work, which de- 

 serves to be widely read and studied both in Europe 

 and America.'''— Br/f/ZttoH (Eng.) Herald. 



"This volume is most stimulating. It is written 

 with great clearness, so that anybody can under- 

 stand, and while in some ways, perforce, superficial, 

 grasps very well the complete field of humanity.''*— 

 The New York Times. 



"Dr. Erinton invests his scientific illustrations and 

 measurements with an indescribable charm of nar- 

 ration, so that 'Races and Peoples,' avowedly a rec- 

 ord of discovered facts, is in reality a strong stim- 

 ulant to the imagination."— Philadelphia Public 

 Ledger. 



"The work is indispensable to the student who re- 

 quires an intelligent guide to a course of ethno- 

 graphic rending,''''— Philadelphia Times. 



Price^ postpaid, $1.T5. 



THE AMERICAN MCE. 



By DANIEL G. BRINTON, M.D. 



" The book is one of unusual interest and value.'"— 

 Inter Ocean. 



" Dr. Daniel Q. Brinton writes as the acknowledged 

 authority of the subiect.'''' ^Philadelphia Press. 



" The work will bo of genuine value to all who 

 wish to know the substance of what has been found 

 out about the indigenous Americans."- iVaiwre. 



"A masterly discussion, and an example of the 

 successful education of the powers of observation.'* 

 — Philadelphia Ledger. 



Price, postpaid, $2, 



N. D. C. HODGES, 



874 BROADWAY, NEW YORK. 



Pennsylvania Bedford Springs Mineral Water 



Por Liver, Kidney ciud B dder Troubles. 



For Gravel, Gall y tones. Jaundice. 



For Dyspepsia, Rheumatism and Gout. 



For Dropsy, Bright's Disease, Diabetes. 



For Hemorrhoids, Ktc. 



It has been used medicinally and prescribed by 

 physicians for nearly one hundred years. 



DIRECTIONS:— Take one or two glasses about a 

 half-hour before each meal. 



Case One Dozen Half-Gallon Bottles, $4.50. 



Case Fifty Quarts (Aerated), ST. 50. 



Bedford K9ineraf Springs Co., Bedford, Pa. 



Philadelphia OfBce, 1004 Walnut St. 



BUILDING 



BOOKS 



1893 Catalogue 



of Books on Building, 

 Pamtiug, and Decorating, 

 also Catalogue of Draw^ 

 ing Instruments and Ma, 

 terials, sent free on appli- 

 cation to 



Wni. T. Coinstock, 



23 Warren St„ New York. 



